Support --use-gitignore via optional flags(AST-179472)

[cx-sumit-morchhale]

Summary

Support passing --use-gitignore flag through --optional-flags mechanism, enabling IDE/CI-CD plugins to pass gitignore configuration.

Changes

• Added use-gitignore to allowedOptionalKeys in utils.go to whitelist the flag as a valid optional parameter
• Modified scan.go to check both command-line flag and optional-flags, with command-line taking priority

How It Works

Users can now pass gitignore filtering in multiple ways:

1. Command-line flag (existing):

   cx scan --use-gitignore --project-name my-project

2. Optional-flags (new):

   cx scan --optional-flags use-gitignore=true --project-name my-project

Feature Priority

1. Command-line flag takes priority
2. Falls back to optional-flags if flag not set
3. Defaults to false if neither is set

Testing

• Supports both --optional-flags use-gitignore=true and --optional-flags=use-gitignore=true syntaxes
• Only true value is recognized as true (simple approach)
• Other values like 1, false, 0 are treated as false

Backward Compatibility

✅ Fully backward compatible - existing command-line usage unchanged

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